X0306 4 2014-02-18 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001368328 Dupont Wesley D ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 EVP & General Counsel Common Shares 2014-02-18 4 A 0 6695 0.00 A 66116 D Common Shares 2014-02-18 4 F 0 3653 100.67 D 62463 D Common Shares 2014-02-19 4 M 0 735 0.00 A 63198 D Common Shares 2014-02-19 4 D 0 735 100.1271 D 62463 D Restricted Stock Units 2014-02-18 4 A 0 2468 A Common Shares 2468 9779 D Restricted Stock Units 2014-02-19 4 M 0 735 D Common Shares 735 9044 D Represents the Company's common shares that were earned pursuant to a 2011 performance-based award for no monetary consideration and which vested at 130% of target based on the achievement of pre-established performance criteria during the applicable three-year performance period established under the Company's Third Amended and Restated 2004 Stock Incentive Plan. Includes 312 common shares acquired on June 30, 2013 pursuant to the Company's Amended and Restated 2008 Employee Share Purchase Plan. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of performance-based awards. On February 19, 2013, the reporting person was granted 2,943 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 2,943 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The fair market value was determined using the daily volume-weighted average sales price of the common shares for the five consecutive trading days up to and including February 19, 2014. Grant of Restricted Stock Units for no monetary consideration. 2,468 Restricted Stock Units convert into (i) 1,234 common shares and (ii) cash equal to the market value of 1,234 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 18, 2015. Represents Restricted Stock Units held by the reporting person that vest in whole or in part in cash. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 19, 2014. /s/ Wayne H. Datz, by Power of Attorney 2014-02-20